DTC 021: Failures Information on Combination Meter: Diagnosis

Required Special Tools:

MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
Use scan tool MB991958 to diagnose the CAN bus lines.
1. Connect scan tool MB991958 to the data link connector.
  
  Fig 1: Connecting Scan Tool MB991958 To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Turn the ignition switch to "ON" position.
3. Diagnose the CAN bus line.
Q: Is the check result satisfactory?
1. YES : Go to Step 2.
2. NO : Repair the CAN bus lines (Refer to DIAGNOSIS < Vehicles without advanced air bag > or < Vehicles with advanced air bag >). On completion, go to Step 6.
STEP 2. Using scan tool MB991958, read the combination meter diagnostic trouble code.
Check that the combination meter sets a DTC.

Q: Is the DTC set?
1. YES : Diagnose the SWS system by referring to SWS DIAGNOSIS-DIAGNOSTIC TROUBLE CODE .
2. NO : Go to Step 3.
STEP 3. Using scan tool MB991958, read the related to the other system diagnostic trouble code
Check if a DTC, which relates to CAN communication-linked systems below, is set.

ETACS-ECU
- DTC 021: Information on failures in combination meter via CAN communication
Q: Is the DTC set?
1. YES : Go to Step 4.
2. NO : Go to Step 5.
STEP 4. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.
Q: Is the check result satisfactory?
1. YES : A poor connection, open circuit or other intermittent malfunction is present in the lines between the combination meter and the middle grade multi-center display unit (Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO : Replace combination meter and then go to Step 6.
STEP 5. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.
Q: Is the check result satisfactory?
1. YES : A poor connection, open circuit or other intermittent malfunction is present in the lines between the combination meter and the middle grade multi-center display unit (Refer to HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO : Replace multi-center display unit (middle grade type) and then go to step 6.
STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is set.
1. Erase the DTC.
2. Turn the ignition switch to "ON" position.
3. Check if the DTC is set.
Q: Is the check result satisfactory?
1. YES : The procedure is complete.
2. NO : Go to Step 1.